This was incredibly enjoyable! Both the big and little little touches made this delightful for me. The concept itself is really fun, I don't think I've seen anything like it before personally. The sounds and music and art are all wonderful and cohesive and made the vibe so chill. The fact that I spammed speed hole buying before realizing I was going to get bigger items and that was in fact very bad for fitting things was really funny. Not sure if this was intended but the way the UI menus in the shop got bigger as my bag expanded was also really funny, and the way the currency values scale made me laugh at how devalued this currency was becoming or how much I was getting scammed.
I would absolutely buy this on steam if fleshed out more, and I almost wonder if you could impose external requirements that make it interesting - maybe i'm sending characters on runs out into the wild so I actually want to send specific items in their bag, or maybe narrative reasons force me to carry specific things, etc. What if I was going on a run through a roguelike map i.e. slay the spire? Clearly was very inspired by your idea. Extremely well done, one of my favorites of the jam!